Improved die for bolt-making- machines



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ROBERT GRACEY, OF, PITTSBURG, PENN SYLVANIA.`

i Letters Patent No. 83,377, lated October 27, 1868.

IMPROVED DIE FOR BOLT-MAKING- MACHINES.

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The Schedule referred to in these Letters Patent and making part: of thesame.

Figure 2 is a sectiomiermed by a plane passing through the axis of thedies and heading-tool, and s howing the position of the heading-tool atthe beginning of a stroke; and

Figure 3is a similar sectional view, showing the position of theheading-tool at the end of the stroke, when the bolt is formed.

Like letters of reference indicate like parts in each, To enable othersskilled in the art to make and use my invention, I will proceed todescribe its construction and mode of operation.

The die-blocks b b', both movable, or onemovable and the otherstationary, I attach to any convenient machinery for imparting to themthe motions ordinarily employed in the manufacture of bolts, as also theheading-tool f. l

To the die-blocks-b b', I attach, in any convenient way, thedies a a,and along the face of each one make a groove, c, of semicircular orother oval shape,such as may be required to enable the dies securely togripe the rod from which the bolt is to be made, give the shank of itthe proper shape, and hold it while a head is being swaged on itsforward end.

The ends d of the dies a a', against which the lower face of thebolt-head is to be formed, I make of such size and shape, that betweenthem and the faces of the die-blocks b b', there shall extend on allsides a recess, e, of any desirable depth and width.

fis a heading-tool, attached to a shaft, f', and of the proper size towork snugly between the faces g ofthe dieblocks b b', when the dies a a"are closed.

The lower face of the heading-tool f has a recess or socket, t', so madethatthe header f may slide neatly over and on to the upper ends cl ofthe dies a a, and, at the same time, leave room between its base andthes ends d for a bolt-head to be formed.

The shape of the socket t' in cross-section may be square, hexagonal, orof such other shape as 4it may be desired to give the bolt-head.

The base of the recess or socket t mayalso be so shaped as to giveto theupper face of the bolt-head any form required.

By boring a socket-barrel, o, in the base of the recess i, of the sizeand shape of the shank of the bolt to be made, I adapt the devicesnamed-for use in making dollar-bolts, as hereinafter described.

In order to prevent the dies we' from being unduly" heated, I introduceinto the recess e, by an an aperture, n, a stream of cold water, whichentirely lls such recess, and which is, by the fall of the header f,forced out through the aperture n', such aperture n heilig somewhat lessin size than the aperturen, so as to insiu'e the filling of the groovee. pipe for the supply of water.

The mode of operation is then as follows The header f being in. theposition shown in iig. 2, an iron rod, previously heated, is introducedbetween the dies a a. as they open,till a sufficient amount of metalprojects beyond the ends rl to forni a bolt-head of the required size.The dies a a are then closed on the rod and gripe it tightly in thegroove c. Atthe instant of the closing ofthe dies a a', the water isturned on at the aperture n by any mechanical deyice ordinarily used forsuch purpose, and immediately yiills the groove e. By a drop- Weight,hammer, cam, or other equivalent device, the header f is at once forceddown to the position shown in iig. 3, and thus swages a head on the endof the rod, between the ends [Z and base and sides of the 'socket t. Itwill be observed that the sides of the socket t' shut down in the recesse, over and on to the ends d of the dies a, a. I thus wholly avoid theformation of a fin or frayed edge along the edges of the lower or upperfaces of the bolt7 which it has been found exceedingly ,diicult `to do,and is as desirable as it is diiicult.

I avoid the injurious strain usual to bolt-machines,

` in which some part of the header plays against axed die.

I avoid loss from compressed air, as the air all escapes along with thewater by the aperture 1t' I thus save a considerable expenditure ofpower, and produce a' superior bolt.

As soon as the bolt-head is thus formed, the header f is withdrawn, thewater again fills the groove c, the dies (t a' open, and, the bolthaving previously been out olf by the devices ordinarily used forthatpurpose, drops out of the groove c, or is removed, if necessary, bystrippers or knockers, or othereqnivalent well-known device.

The opening of the dies ct a cuts off the supply of water.

To make a collar-bolt, which is, practically, a double bolt with acollar between its two ends, I use a head- 'ing-tool, f, (iig. 2,)having a socket-barrel, o. The rod is then heated, and its forward endintroduced into the socket-barrel o a suliicient distance to give oneend of the bolt required. The dies a a then close, the header f descendsas above described and swages a collar on the bolt between the ends al.of the dies a a' and the base .of the recess t, as above set forth. i

The remainder of the process is as already described. What I claim as myinvention, and desire to secure by Letters Patent, is-

l. The combination of the dies va c', die-blocks b b', and plunger f,with. or without'the socket o, said parts being arranged substantiallyas described.

2. The griping-dies a a, with raised proj ectiond, in combination withthe die-blocks b l1, having waterpassages a n', when so arranged,substantially as hereinbefore described, as to form an enclosed spacefor the passage of water around the raised portion of the dies wheneverthe heading-tool is withch'awn.

In testimony whereof, I, the said ROBERT GRACEY, have hereunto set myhand.

vlVitnesses: ROBERT GRACEY.

Enr. Tomi-ANGE, G. H. CHRISTY.

The aperture n has a l

